I have made a comparison between 188.8.131.52 and 184.108.40.206 in file systems and databases. There is only one notable change in sendmail.php file. All the other files have minor changes in one line, 2016 year is now 2017 and 33 file names have been changed to 220.127.116.11.
A question is rising up, what is really 18.104.22.168 release? It is promoted with a lot of security patches but is not different than 22.214.171.124 except one file sendmail.php. I expected improvements or bug fixes but nothing was found so far. Very disappointed how Magento team is managing the new versions.